Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
  • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
  • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
  • C08G73/14—Polyamide-imides
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
  • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
  • C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
  • C08G69/12—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids with both amino and carboxylic groups aromatically bound
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
  • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
  • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
  • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
  • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
  • C08G73/1039—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors comprising halogen-containing substituents
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
  • C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
  • C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Definitions

• the present invention relates to a polyamide-imide resin film.
• An aromatic polyimide resin is a polymer mostly having an amorphous structure, and exhibits excellent heat resistance, chemical resistance, electrical characteristics, and dimensional stability due to its rigid chain structure.
• Such a polyimide resin is widely used for electric/electronic materials.
• the polyimide resin has many limitations in use, because it is dark brown due to the formation of a CTC (charge transfer complex) of ⁇ electrons present in the imide chain.
• CTC charge transfer complex
• a strong electron attracting group such as a trifluoromethyl (-CF 3 ) group
• a method of reducing the formation of the CTC by introducing a sulfone (-SO 2 -) group, an ether (-O-) group, or the like into the main chain to make a bent structure
• a method of inhibiting the formation of the resonance structure of the ⁇ electrons by introducing an aliphatic cyclic compound have been proposed.
• the present invention provides an aromatic polyamide-imide copolymer film exhibiting excellent mechanical properties while being colorless and transparent.
• a polyimide-based film including the above-mentioned polyamide-imide block copolymer is provided.
• a polyamide-imide resin film including: a polyamide-imide block copolymer containing an amide repeating unit to which an isophthaloyl group and an aromatic diamine residue are bonded; an imide repeating unit; and a trivalent functional group containing an aromatic tricarbonyl group, wherein retardation (Rth) in the thickness direction measured at a wavelength of 590 nm is 2000 nm or less.
• the polyamide-imide block copolymer contains an amide repeating unit to which an isophthaloyl group and an aromatic diamine residue are bonded, it can have a polymer inner structure capable of not only preventing chain packing by including a repeating unit having a bent structure in the main chain, thus reducing charge transfer between aromatic groups (benzene, etc.), but also slightly reducing the chain orientation to decrease the directionality, whereby it is possible to provide a film which is excellent in processability and thus facilitates formation of films, and which is colorless and transparent and has excellent mechanical properties.
• the polyamide-imide block copolymer includes a trivalent functional group containing an aromatic tricarbonyl group, it can provide a predetermined crosslinking structure or a network structure therein.
• a rigid and stable network structure can be formed in the copolymer, and such a rigid and stable network structure allows the polyamide-imide block copolymer to exhibit improved mechanical properties while being colorless and transparent.
• a block containing the amide repeating unit and a block containing the imide repeating unit may be bonded via a trivalent functional group containing the aromatic tricarbonyl group.
• the retardation (Rth) in the thickness direction measured at a wavelength of 590 nm with respect to the polyamide-imide resin film may be 2000 nm or less, 200 nm to 2000 nm, 300 nm to 1500 nm, 400 nm to 1200 nm, or 500 nm to 1000 nm.
• the polyamide-imide resin film has retardation (Rth) in the thickness direction measured at a wavelength of 590 nm of 2000 nm or less, it has isotropy and thus has a certain transparency in all directions in optical characteristics, and can have a feature that the reproducibility according to the manufacturing conditions and the thickness is superior to that of anisotropic materials at the time of producing the film.
• the thickness-direction retardation (Rth) of the polyamide-imide resin film can be confirmed by a commonly known measurement method and measurement apparatus.
• the retardation (Rth) in the thickness direction can be determined using a measuring apparatus manufactured by AXOMETRICS, Inc. under the trade name of AxoScan, Prism Coupler, and the like.
• the retardation (Rth) in the thickness direction can be determined by: inputting a value of a refractive index (589 nm) of the polyamide-imide resin film into the measuring apparatus, then measuring the thickness-direction retardation of the polyamide-imide resin film by using light at a wavelength of 590 nm under conditions of a temperature of 25 °C and a humidity of 40 %, and converting the measured value of the thickness-direction retardation thus determined (the value is measured according to the automatic measurement (automatic calculation) of the measuring apparatus) into a retardation value per 10 ⁇ m of the thickness of the film.
• a refractive index 589 nm
• the value of the "refractive index (589 nm) of the polyimide film" utilized in the measurement of the thickness-direction retardation (Rth) can be determined by forming an unstretched film including the same kind of polyamide-imide resin film as the polyamide-imide resin film for forming the film to be measured for the retardation, and then measuring the unstretched film as a measurement sample (in the case where the film to be measured is an unstretched film, the film can be directly used as the measurement sample) for the refractive index for light at 589 nm in an in-plane direction (the direction perpendicular to the thickness direction) of the measurement sample by using a refractive index-measuring apparatus (manufactured by Atago Co., Ltd. under the trade name of "NAR-1T SOLID”) as a measuring apparatus under a light source of 589 nm and a temperature condition of 23 °C.
• a refractive index-measuring apparatus manufactured by Atago Co
• an unstretched film is utilized to measure the intrinsic refractive index (589 nm) of the polyamide-imide resin film, and the measurement value thus obtained is utilized in the measurement of the above-described thickness-direction retardation (Rth).
• the size of the polyamide-imide resin film as a measurement sample is not particularly limited, as long as the size can be utilized in the refractive index-measuring apparatus.
• the size may be 1 cm square (1 cm in length and width) and 13 ⁇ m in thickness.
• the polyamide-imide block copolymer exhibits excellent processability resulting from bonding at a meta position of the second repeating unit, and at the same time, exhibits excellent mechanical properties (in particular, hardness and modulus) resulting from bonding at a para position of the third repeating unit.
• the polyamide-imide block copolymer may include a first repeating unit having an introduced trivalent brancher (Z 10 ), a second repeating unit having an introduced group (Z 20 ) in which two carbonyl groups are bonded to the meta position, and a third repeating unit having an introduced group (Z 30 ) in which two carbonyl groups are bonded to the para position.
• the polyamide-imide block copolymer is excellent in processability of the resin itself, and therefore, it not only facilitates formation of films using it, but also enables provision of a film having improved mechanical properties while being colorless and transparent.
• the single bond means a case where R 11 in Chemical Formula 1 is a chemical bond that simply connects groups on both sides.
• n1 and m1 are each independently an integer of 0 to 3.
• the n1 and m1 are each independently an integer of 0 to 1.
• each Y 10 is the same as or different from each other in each repeating unit, and each independently includes a divalent aromatic organic group having 6 to 30 carbon atoms.
• Y 10 may be a divalent organic group represented by the following structural formula: wherein, in the above structural formula,
• E 11 , E 12 , and E 13 are each independently a single bond or -NH-.
• the single bond means a case where E 11 , E 12 , and E 13 simply connect groups on both sides or repeating units.
• Z 10 is a brancher having three reactive substituents, which are the same as or different from each other in each repeating unit, and each represents a trivalent linking group derived from one or more compounds selected from the group consisting of triacyl halide, tricarboxylic acid, and tricarboxylate.
• Z 10 may be a trivalent linking group derived from one or more compounds which are selected from the group consisting of an aromatic triacyl halide having 6 to 20 carbon atoms, an aromatic tricarboxylic acid having 6 to 20 carbon atoms, an aromatic tricarboxylate having 6 to 20 carbon atoms, an N-containing heteroaromatic triacyl halide having 4 to 20 carbon atoms, an N-containing heteroaromatic tricarboxylic acid having 4 to 20 carbon atoms, an N-containing heteroaromatic tricarboxylate having 4 to 20 carbon atom, an alicyclic triacyl halide having 6 to 20 carbon atoms, an alicyclic tricarboxylic acid having 6 to 20 carbon atoms, and an alicyclic tricarboxylate having 6 to 20 carbon atoms.
• Z 10 may be a group selected from the group represented by the following structural Formulae:
• Z 10 may be a trivalent linking group derived from one or more compounds which are selected from the group consisting of 1,3,5-benzenetricarbonyl trichloride, 1,2,4-benzenetricarbonyl trichloride, 1,3,5-benzenetricarboxylic acid, 1,2,4-benzenetricarboxylic acid, trimethyl 1,3,5-benzenetricarboxylate, and trimethyl 1,2,4-benzenetricarboxylate.
• the first repeating unit may include a repeating unit represented by the following Chemical Formula 1-a: wherein, in Chemical Formula 1-a,
• each Y 20 is the same as or different from each other in each repeating unit, and each independently includes a divalent aromatic organic group having 6 to 30 carbon atoms.
• E 21 , E 22 , and E 23 are each independently a single bond or -NH-.
• the single bond means a case where E 21 , E 22 , and E 23 simply connect groups on both sides or repeating units.
• Z 20 may be a group selected from the group consisting of the following structural Formulae: wherein, in the above structural Formulae,
• Z 20 may be a group selected from the group represented by the following structural Formulae:
• Z 20 may be a divalent linking group derived from one or more compounds which are selected from isophthaloyl dichloride (IPC), isophthalic acid, cyclohexane-1,3-dicarbonyl chloride, cyclohexane-1,3-dicarboxylic acid, pyridine-3,5-dicarbonyl chloride, pyridine-3,5-dicarboxylic acid, pyrimidine-2,6-dicarbonyl chloride), and pyrimidine-2,6-dicarboxylic acid.
• IPC isophthaloyl dichloride
• isophthalic acid cyclohexane-1,3-dicarbonyl chloride
• cyclohexane-1,3-dicarboxylic acid pyridine-3,5-dicarbonyl chloride
• pyridine-3,5-dicarboxylic acid pyrimidine-2,6-dicarbonyl chloride
• the second repeating unit may include a repeating group represented by the following Chemical Formula 2-b: wherein, in Chemical Formula 2-b,
• each Y 30 is the same as or different from each other in each repeating unit, and each independently includes a divalent aromatic organic group having 6 to 30 carbon atoms.
• Y 30 may be a divalent organic group represented by the following structural formula: wherein, in the above structural formula,
• E 31 , E 32 , and E 33 are each independently a single bond or -NH-.
• the single bond means a case where E 31 , E 32 , and E 33 simply connect groups on both sides or repeating units.
• Z 30 may be a divalent linking group derived from one or more compounds which are selected from the group consisting of terephthaloyl chloride (TPC), terephthalic acid, cyclohexane-1,4-dicarbonyl chloride, cyclohexane-1,4-dicarboxylic acid, pyridine-2,5-dicarbonyl chloride, pyridine-2,5-dicarboxylic acid, pyrimidine-2,5-dicarbonyl chloride, pyrimidine-2,5-dicarboxylic acid, 4,4'-biphenyldicarbonyl chloride (BPC), and 4,4'-biphenyldicarboxylic acid.
• TPC terephthaloyl chloride
• BPC 4,4'-biphenyldicarbonyl chloride
• BPC 4,4'-biphenyldicarboxylic acid
• the third repeating unit may include a repeating unit represented by the following Chemical Formula 3-a: wherein, in Chemical Formula 3-a,
• the third repeating unit may include a repeating unit represented by the following Chemical Formulae 3-b or 3-c: wherein, in Chemical Formulae 3-b and 3-c,
• the presence of the second repeating unit represented by Chemical Formula 2 and the third repeating unit represented by Chemical Formula 3 in the polyamide-imide block copolymer can be confirmed by NMR spectroscopy.
• the peak according to Z 20 (including two carbonyl groups bonded to a meta position) of the second repeating unit may be observed within the ⁇ range of 10.80 ppm or more and 11.00 ppm or less; and the peak according to Z 30 (including two carbonyl groups bonded to a para position) of the third repeating unit may be observed within the ⁇ range of 10.60 ppm or more and 10.80 ppm or less.
• the molar ratio of the third repeating unit to the second repeating unit may be 0.5 to 3.
• the polyamide-imide block copolymer has a rigid and stable network structure, and thus can have a higher molecular weight than a general linear polyimide resin.
• the polyamide-imide block copolymer has a weight average molecular weight of 100,000 to 5,000,000 g/mol, preferably 200,000 to 1,000,000 g/mol, more preferably 300,000 to 750,000 g/mol, and even more preferably 500,000 to 650,000 g/mol.
• the polyamide-imide block copolymer may exhibit a yellowness index (Y.I.) of 3.0 or less, 2.90 or less, 2.80 or less, 2.70 or less, 2.60 or less, or 2.55 or less as measured for a specimen having a thickness of 30 ⁇ 2 ⁇ m according to ASTM D1925.
• Y.I. yellowness index
• the polyamide-imide resin film can be used as material for various molded articles requiring high mechanical properties together with colorless transparency.
• the polyimide-based film containing the polyamide-imide block copolymer may be applied to substrates for displays, protective films for displays, touch panels, cover films for flexible or foldable devices, and the like.
• stretching and heat treating the polyimide-based film may be carried out.
• the polyimide-based film is produced using the polyamide-imide block copolymer, it can exhibit excellent mechanical properties while being colorless and transparent.
• the polyimide-based film may exhibit a pencil hardness of an HB grade or higher as measured according to ASTM D3363.
• a polyamide-imide resin film having excellent mechanical properties while being colorless and transparent can be provided.
• Such a polyamide-imide resin film can be applied to substrates for displays, protective films for displays, touch panels, and cover films for flexible or foldable devices due to the above-described properties.
• Example 2 The copolymer obtained in Example 1 was dissolved in N,N-dimethylacetamide to prepare an about 10 % (w/v) polymer solution.
• the polymer solution was poured on a glass plate heated to 40 °C, and the polymer solution was cast to a thickness of 1200 ⁇ m using a film applicator and dried for 60 minutes.
• the mixture was slowly heated from 120 °C to 200 °C for 4 hours under a nitrogen purge (maintained at 200 °C for 120 minutes), and then gradually cooled to obtain a film having a thickness of 30 ⁇ 2 ⁇ m that was peeled off from the glass substrate.
• a film having a thickness of 30 ⁇ 2 ⁇ m and a film having a thickness of 50 ⁇ 2 ⁇ m were respectively obtained in the same manner as in Example 2, except that the copolymer obtained in Comparative Example 1 was used instead of the copolymer obtained in Example 1.
• the pencil hardness of a film having a thickness of 30 ⁇ 2 ⁇ m was measured in accordance with the ASTM D3363 method (750 gf) using a Pencil Hardness Tester.
• the yellowness index of the films having a thickness of 30 ⁇ 2 ⁇ m was measured in accordance with the ASTM D1925 method using a UV-2600 UV-Vis Spectrometer (SHIMADZU).
• the haziness of the films having a thickness of 30 ⁇ 2 ⁇ m was measured in accordance with the ASTM D1003 method using a COH-400 Spectrophotometer (NIPPON DENSHOKU INDUSTRIES).
• the folding endurance of the films was evaluated using an MIT type of folding endurance tester. Specifically, a specimen (1 cm ⁇ 7 cm) of the film was loaded into the folding endurance tester, and folded to an angle of 135° at a rate of 175 rpm on the left and right sides of the specimen, with a radius of curvature of 0.8 mm and a load of 250 g, until the specimen was bent and fractured. The number of reciprocating bending cycles was measured as the folding endurance.
• the degree of transparency of the film having a thickness of 50 ⁇ 2 ⁇ m as compared with the film having a thickness of 30 ⁇ 2 ⁇ m was observed with the naked eye.
• the polyamide-imide resin film of Example 2 had low yellowness index and haze and thus had colorless and transparent optical characteristics, and further exhibited a low level of elastic modulus, high tensile elongation, and the like together with high pencil hardness, thus having excellent mechanical properties.

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• 2018
  • 2018-01-09 KR KR1020180002877A patent/KR102233984B1/ko active IP Right Grant
  • 2018-12-07 WO PCT/KR2018/015463 patent/WO2019139257A1/ko unknown
  • 2018-12-07 JP JP2019571391A patent/JP2020525582A/ja active Pending
  • 2018-12-07 EP EP18899844.7A patent/EP3626766A4/de not_active Withdrawn
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  • 2018-12-07 US US16/630,242 patent/US11407858B2/en active Active
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